/Engine/Source/Editor/UnrealEd/Public/Subsystems/EditorAssetSubsystem.h
Duplicate a directory and the assets in it. Will try to checkout the files. The Assets will be loaded before being duplicated.
The duplicated object if the operation succeeds.
bool DuplicateDirectory ( const [FString](API\Runtime\Core\Containers\FString) & SourceDirectoryPath, const [FString](API\Runtime\Core\Containers\FString) & DestinationDirectoryPath )